TW200623095A - Optical device for recording and reproducing - Google Patents

Optical device for recording and reproducing

Info

Publication number
TW200623095A
TW200623095A TW094129687A TW94129687A TW200623095A TW 200623095 A TW200623095 A TW 200623095A TW 094129687 A TW094129687 A TW 094129687A TW 94129687 A TW94129687 A TW 94129687A TW 200623095 A TW200623095 A TW 200623095A
Authority
TW
Taiwan
Prior art keywords
radiation beam
optical device
radiation
intensity
central axis
Prior art date
Application number
TW094129687A
Other languages
Chinese (zh)
Inventor
Joris J Vrehen
Petrus T Jutte
Original Assignee
Koninkl Philips Electronics Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninkl Philips Electronics Nv filed Critical Koninkl Philips Electronics Nv
Publication of TW200623095A publication Critical patent/TW200623095A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1398—Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • G11B7/1275—Two or more lasers having different wavelengths
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

The invention relates to an optical device comprising a first radiation source (101) for producing a first radiation beam, a second radiation source (101) for producing a second radiation beam and means for directing the first and second radiation beams along a common optical path. Each radiation beam has an intensity distribution, a central axis and an outer envelope. The optical device further comprises, in the common optical path, means (103) for modifying the intensity distribution of the first radiation beam only. This means are designed for increasing the ratio between the intensity near the envelope and the intensity near the central axis of the first radiation beam by reducing at least the intensity of the first radiation beam near its central axis.
TW094129687A 2004-09-02 2005-08-30 Optical device for recording and reproducing TW200623095A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04300572 2004-09-02

Publications (1)

Publication Number Publication Date
TW200623095A true TW200623095A (en) 2006-07-01

Family

ID=35207893

Family Applications (1)

Application Number Title Priority Date Filing Date
TW094129687A TW200623095A (en) 2004-09-02 2005-08-30 Optical device for recording and reproducing

Country Status (5)

Country Link
US (1) US20080095016A1 (en)
EP (1) EP1789964A1 (en)
JP (1) JP2008512805A (en)
TW (1) TW200623095A (en)
WO (1) WO2006024986A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11185282A (en) * 1997-12-19 1999-07-09 Sony Corp Optical pickup and optical disk device
JP2001134972A (en) * 1999-11-09 2001-05-18 Hitachi Ltd Semiconductor laser module and optical information reproducing device using it
WO2002025646A1 (en) * 2000-09-25 2002-03-28 Koninklijke Philips Electronics N.V. Optical scanning device
US6963522B2 (en) * 2001-05-31 2005-11-08 Nec Corporation Optical head apparatus and optical information recording and reproducing apparatus
KR20030035519A (en) * 2001-10-31 2003-05-09 삼성전자주식회사 Phase compensator and compatible optical pickup employing it
JP3849523B2 (en) * 2001-12-26 2006-11-22 ティアック株式会社 Optical pickup and optical disc apparatus
US20030214898A1 (en) * 2002-04-15 2003-11-20 Tetsuya Ogata Optical pickup device and optical disk drive using the same
WO2004059628A1 (en) 2002-12-30 2004-07-15 Koninklijke Philips Electronics N.V. Optical device for recording and reproducing

Also Published As

Publication number Publication date
JP2008512805A (en) 2008-04-24
US20080095016A1 (en) 2008-04-24
EP1789964A1 (en) 2007-05-30
WO2006024986A1 (en) 2006-03-09

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